Pseudodynamic off-chip driver calibration

Active Publication Date: 2005-05-05
POLARIS INNOVATIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0042] For respective operating points to differ from the mid-value of the supply voltages by at most, for example, 35% of the difference between the supply voltages is a beneficial restric

Problems solved by technology

Such matching of the off-chip driver has been found to be disadvantageous in many applications, inter alia as an interface between DDR memory modules (DDR=“double-data-rate”) and corresponding extern

Method used

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  • Pseudodynamic off-chip driver calibration
  • Pseudodynamic off-chip driver calibration
  • Pseudodynamic off-chip driver calibration

Examples

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Example

[0053]FIG. 2 shows a driver calibration circuit arrangement 30 according to a first exemplary embodiment of the invention, together with a driver circuit arrangement 20, illustrated schematically. The illustration shows a driver calibration circuit arrangement 30, which has a monitoring device 31, a variable impedance 32, a reference voltage divider 33, a comparator 34, and control lines 36. The driver calibration circuit arrangement 30 is connected to a reference impedance ZRef and to the driver circuit arrangement 20. The latter connection is made via a control line 24 which, for example, has four conductors. The variable impedance 32 comprises two or more switchable impedances 35A-D, which can be switched on and off via the control lines 36. The driver circuit arrangement 20 has a pull-up branch 21 and a pull-down branch 22, whose respective impedance can be influenced via the control line 24.

[0054] Together with the reference impedance ZRef, the variable impedance 32 forms a vo...

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Abstract

A driver system, a driver calibration circuit arrangement for calibration of an impedance of a driver circuit arrangement, and a method for calibration of an impedance of a driver circuit arrangement can achieve improved driver behavior, with respect to undesirable distortions of the slew rate caused by off-chip drivers of DDR memory modules. A driver system has a first driver part with at least one variable impedance by which an operating point of the first driver part is determined with respect to a first potential and a second potential. The potentials supply the first driver part. A first monitoring device adjusts an impedance value of the variable impedance such that the operating point differs from a mid-point of the first and of the second potential.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority under 35 USC § 119 to German Application No. DE 10351016.8, filed on Oct. 31, 2003, and titled “Pseudodynamic Off-Chip Driver Calibration,” the entire contents of which are hereby incorporated by reference. FIELD OF THE INVENTION [0002] The present invention relates to a driver system, a driver calibration circuit arrangement for calibration of an impedance of a driver circuit arrangement, and a method for calibration of an impedance of a driver circuit arrangement. BACKGROUND [0003] Off-chip drivers are known for carrying out various tasks. For example, off-chip drivers are used where a signal which has been produced within a chip, i.e., within an integrated semiconductor circuit (also referred to as a module) is intended to be amplified before being transmitted to a circuit, which is external to the chip. The signal power or the signal level of the signal, which is produced on the chip, can be matched ...

Claims

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Application Information

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IPC IPC(8): H03K19/00
CPCH03K19/0005
Inventor NYGREN, AARON
Owner POLARIS INNOVATIONS
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